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Financial Risk Management - Summary of Cash, Cash Equivalents and Interest-Bearing Securities (Detail) - SEK (kr) kr in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Bank deposits | kr 41,138 | kr 33,479
Other financial institutions | 1,437 | 548
Cash, cash equivalents, interest bearing securities and derivative assets | 75,871 | 54,705
Maturity within 3 months [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Bank deposits | 40,749 | 33,298
Other financial institutions | 1,437 | 548
Cash, cash equivalents, interest bearing securities and derivative assets | 49,497 | 38,140
Maturity between 3 and 12 months [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Bank deposits | 389 | 181
Other financial institutions | 0 | 0
Cash, cash equivalents, interest bearing securities and derivative assets | 6,935 | 6,635
Maturity less than five years [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Bank deposits | 0 | 0
Other financial institutions | 0 | 0
Cash, cash equivalents, interest bearing securities and derivative assets | 18,053 | 9,930
2026 and later [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Bank deposits | 0 | 0
Other financial institutions | 0 | 0
Cash, cash equivalents, interest bearing securities and derivative assets | 1,386 | 0
AA/AAA [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Type of issuer/counterpart Governments | 9,412 | 2,533
AA/AAA [member] | Maturity within 3 months [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Type of issuer/counterpart Governments | 4,639 | 789
AA/AAA [member] | Maturity between 3 and 12 months [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Type of issuer/counterpart Governments | 995 | 490
AA/AAA [member] | Maturity less than five years [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Type of issuer/counterpart Governments | 3,175 | 1,254
AA/AAA [member] | 2026 and later [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Type of issuer/counterpart Governments | 603 | 0
A2/P2 [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Corporates | 2,870 | 1,806
A2/P2 [member] | Maturity within 3 months [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Corporates | 2,672 | 1,510
A2/P2 [member] | Maturity between 3 and 12 months [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Corporates | 198 | 296
A2/P2 [member] | Maturity less than five years [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Corporates | 0 | 0
A2/P2 [member] | 2026 and later [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Corporates | 0 | 0
AAA [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Mortgage institutes | 21,014 | 16,339
AAA [member] | Maturity within 3 months [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Mortgage institutes | 0 | 1,995
AAA [member] | Maturity between 3 and 12 months [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Mortgage institutes | 5,353 | 5,668
AAA [member] | Maturity less than five years [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Mortgage institutes | 14,878 | 8,676
AAA [member] | 2026 and later [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Mortgage institutes | kr 783 | kr 0

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